Issue connecting to IRC Server - c++

Question

Been working on creating an IRC bot recently, and while it seems to connect & work with most IRC servers, it seems to have issues with the Twitch IRC server (irc.twitch.tv).
When connecting to another server, data is received & sent without any issues, however with the twitch connection, I can't send or receive data.
Initialize:
Connection::Connection(char* server, int port, std::string nick, std::string pass)
{
fServer = server;
fPort = port;
fNick = nick;
fPass = pass;
fChanCount = 0;
clear_buffer();
fSock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
cout << "Attempting to resolve host: " << fServer << endl;
fHost = resolve_host(fServer);
fSaddr.sin_addr.S_un.S_addr = fHost;
fSaddr.sin_port = htons(fPort);
fSaddr.sin_family = AF_INET;
cout << "Resolved to: " << fHost << endl;
}
Open Connection:
int Connection::Connect()
{
if (connect(fSock, (sockaddr*)&fSaddr, sizeof(fSaddr)) == SOCKET_ERROR)
{
cout << "Can't connect to " << fServer << endl;
return 0;
}
recv(fSock, fBuffer, 1024 * 8, 0);
cout << fBuffer << endl << endl << flush;
send_message("PASS " + fPass);
send_message("NICK " + fNick);
send_message("USER " + fNick + " 0 * :" + fNick);
return 1;
}
Clear Buffer:
void Connection::clear_buffer()
{
memset(fBuffer, 0, sizeof(fBuffer));
}
Receive:
string Connection::receive_message()
{
clear_buffer();
recv(fSock, fBuffer, 1024 * 8, 0);
return fBuffer;
}
Completely stumped on what could be causing this, can provide more detail if needed.

Answer 1

Your USER message does not look like what the RFC2812 spec is asking for.
3.1.3 User message
Command: USER
Parameters: <user> <mode> <unused> <realname>
The USER command is used at the beginning of connection to specify
the username, hostname and realname of a new user.
The <mode> parameter should be a numeric, and can be used to
automatically set user modes when registering with the server. This
parameter is a bitmask, with only 2 bits having any signification: if
the bit 2 is set, the user mode 'w' will be set and if the bit 3 is
set, the user mode 'i' will be set. (See Section 3.1.5 "User
Modes").
The <realname> may contain space characters.
Numeric Replies:
ERR_NEEDMOREPARAMS ERR_ALREADYREGISTRED
Example:
USER guest 0 * :Ronnie Reagan ; User registering themselves with a
username of "guest" and real name
"Ronnie Reagan".
USER guest 8 * :Ronnie Reagan ; User registering themselves with a
username of "guest" and real name
"Ronnie Reagan", and asking to be set
invisible.
Perhaps that's what is causing the problem?
Otherwise I have found some servers require a password in the PASS message even if the server is not configured to require one. In those cases I send:
PASS none